The melting behavior of the monoamides of general formula n-CpH2p+1CONHCqH2q+1-n is investigated by differential scanning calorimetry and IR. The lower values of melting entropies, compared to those for linear hydrocarbons with the same no. of conformationally flexible chain bonds, is attributed to a redn. in the no. of conformations available to the hydrocarbon portion of the mol., because of the large amt. of H bonding maintained in the melt. The melting behavior of the monoamides is compared with that of the diamides. The persistence of a network of H bonds in the melt of the diamides reduces the conformational freedom of the chain segments more than for the monoamides.

MELTING BEHAVIOR OF A SERIES OF MONOAMIDES

CARFAGNA, COSIMO;BUSICO, VINCENZO;VACATELLO, MICHELE
1980

Abstract

The melting behavior of the monoamides of general formula n-CpH2p+1CONHCqH2q+1-n is investigated by differential scanning calorimetry and IR. The lower values of melting entropies, compared to those for linear hydrocarbons with the same no. of conformationally flexible chain bonds, is attributed to a redn. in the no. of conformations available to the hydrocarbon portion of the mol., because of the large amt. of H bonding maintained in the melt. The melting behavior of the monoamides is compared with that of the diamides. The persistence of a network of H bonds in the melt of the diamides reduces the conformational freedom of the chain segments more than for the monoamides.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/495706
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